mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 1018
mc9s12xd256
Manufacturer Part Number
mc9s12xd256
Description
Hcs12x Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12XD256.pdf
(1350 pages)
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Chapter 24 DG128 Port Integration Module (S12XDG128PIMV2)
24.0.5.46 Port H Pull Device Enable Register (PERH)
Read: Anytime.
Write: Anytime.
This register configures whether a pull-up or a pull-down device is activated, if the port is used as input.
This bit has no effect if the port is used as output. Out of reset no pull device is enabled.
24.0.5.47 Port H Polarity Select Register (PPSH)
Read: Anytime.
Write: Anytime.
This register serves a dual purpose by selecting the polarity of the active interrupt edge as well as selecting
a pull-up or pull-down device if enabled.
1018
RDRH[7:0]
PERH[7:0]
Reset
Reset
Field
Field
7–0
7–0
W
W
R
R
PERH7
PPSH7
Reduced Drive Port H
0 Full drive strength at output.
1 Associated pin drives at about 1/6 of the full drive strength.
Pull Device Enable Port H
0 Pull-up or pull-down device is disabled.
1 Either a pull-up or pull-down device is enabled.
0
0
7
7
PERH6
PPSH6
Figure 24-48. Port H Pull Device Enable Register (PERH)
0
0
6
6
Figure 24-49. Port H Polarity Select Register (PPSH)
Table 24-42. RDRH Field Descriptions
Table 24-43. PERH Field Descriptions
PERH5
PPSH5
MC9S12XDP512 Data Sheet, Rev. 2.17
0
0
5
5
PERH4
PPSH4
0
0
4
4
Description
Description
PERH3
PPSH3
0
0
3
3
PERH2
PPSH2
0
0
2
2
PERH1
PPSH1
Freescale Semiconductor
0
0
1
1
PERH0
PPSH0
0
0
0
0
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